Patent · US Expired

Method controlling the focusing of an ultrasonic field and apparatus for performing said method

US4725989A · kind A · utility

8Cited by

7References

9Claims

0Family size

Assignee

Siemens Aktiengesellschaft · DE

Inventors

Bernd Granz · Oberasbach, DE
Peter Krammer · Heidelberg, DE
Bertram Sachs · Regensburg, DE

Key dates

Filing date	Dec 12, 1986
Grant date	Feb 16, 1988
Priority date	—
Expiry date	Dec 12, 2006

Classification

Technology area (CPC G)Physics
CPC primaryG10K11/26
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

The invention concerns a method for surveying the focal point (F, F') of a focussed ultrasonic field (8, 14) and an apparatus for carrying out the method. According to the invention an ultrasonic field (4, 12) produced by an ultrasonic transmitter (2) is measured at several sites in a plane in the path of the waves at the site of the imaging device (6). The values determined at these sites are compared with given reference values for which the position of the focus is known. In an advantageous device, one surface of the imaging device (6) is equipped with several piezoelectric transducers.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.